The three gentlemen from whom I have quoted - Early, Imboden, and Slingluff, - refer to the humane manner in which General Lee conducted his campaign in Pennsylvania in 1863, and claim that no wanton destruction of private property was made. This is freely admitted. With the exception of the railroad buildings in Chambersburg, and one or two buildings on the field of Gettysburg, no houses or barns were destroyed. Private property was taken for the use of the army, but, except in a few cases by stragglers, the regulations of seizure laid down by General Lee in general orders No. 72, and issued specially for the Pennsylvania campaign, were strictly observed.
With respect to your post of Sherman's orders, let's look at the actions of some of his soldiers in Georgia and the Carolinas. Union commanders weren't very effective at curbing looting, burning, etc.
Col. Acker, 9th Michigan Cavalry, Dec 19, 1864: "During that day we marched thirty-nine miles and took six prisoners. 20th, Companies B, C, and D, being detached for a scout to Griswold Station in charge of Captain Ladd, meeting the enemy, but keeping them at bay, burned the town, destroying the railroad, cutting the telegraph wire, burned a train of cars."
General Howard (Union) to General Sherman, Dec. 28, 1864: "I regret to say that quite a number of private dwellings which the inhabitants have left, have been destroyed by fire, but without official sanction; also, many instances of the most inexcusable and wanton acts, such as the breaking open of trunks, taking of silver plate, &c."
Brevet Major General Williams (Union) to the Twentieth Corps, Robertsville, SC, Jan. 31, 1865: "The indiscriminate pillage of houses is disgraceful and demoralizing to this Army. The houses in this vicinity, of free negroes even, have been stripped of the necessary bedclothes and of family apparel. Brigade commanders will at once take measures to put a stop to these infamous practices. ... The brevet Major-general commanding the corps expects the hearty co-operation of all officers to put a stop to practices disgraceful to our arms and shocking to humanity."
General Sherman, Feb 1865: "Vacant houses being of no use to anybody, I care little about, as the owners have thought them of no use to themselves. I don't want them destroyed, but do not take much care to preserve them."
Gen. Howard (Union), Feb. 9, 1865, General Field Orders No. 9, issued near Binnaker's Bridge, SC: "The attention of the general commanding has been called by officers of our own army to the wanton and indiscriminate destruction of private property, burning of dwelling houses, plundering and pillaging the houses of the few poor people who have remained at home ..."
On June 25, Jubal Early's division passed through Cashtown Gap on their way to Gettysburg. Located there was an iron smelter belonging to U.S. Congressman Thaddeus Stevens. Early ordered the smelter destroyed and the supplies siezed. In the process, Early's men also looted the homes of the workers employed at the smelter. This is detailed in "Gettysburg: A Testing of Courage" by Noah Andre Trudeau, pp. 82-83 and the source is Jubal Early's own papers at the Library of Congress. So I guess my question is did this act just slip Jubal Early's mind? Or maybe he thought it just didn't count? Or maybe he was lying in your account?
Union commanders weren't very effective at curbing looting, burning, etc.
Apparently neither were the confederate commanders.